[Haskell-cafe] how to catch/bracket in yesod-1.6?

Dear Cafe, I wonder what's the recommended way to catch an exception, clean up resources, etc., in a yesod Handler. I was using Control.Monad.Catch.bracket_ in legacy code but now I get "No instance for (Control.Monad.Catch.MonadMask (HandlerFor App))" - J